JP2001285395A - Storage device of communication data and reproduction device of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the communication data stored in a storage device is falsified and that it is difficult to detect whether the data is falsified or not. SOLUTION: A storage device of communication data comprises a flag information creator creating a flag information showing a sound part and a silent part of the communication data, a header information creator creating a detecting information by using the communication data information and the flag information and creating a header information including the detecting information and the communication data information and a block data creator adding the header information to the communication data to create a block data. A reproduction device of the communication data comprises a header retrieving part retrieving the flag information, an ID information and the detecting information from the header information, a detecting information analyzer encrypting the ID information to create encrypted ID information and retrieving the flag information by using the encrypted ID information and the detecting information, and a falsifying detector comparing the flag information with the header information retrieved from the header retrieving part and deciding the matching of those information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication data recording apparatus for recording communication data transmitted by a communication means on a recording medium, and a communication data reproducing apparatus for reproducing data recorded on the recording medium and outputting communication data. About.

[0002]

2. Description of the Related Art In a financial business such as a bank or securities, a mail order business, or a public business such as a horse race, transactions are sometimes made using a telephone line. In such a case, it may be required to record the contents of the telephone call as confirmation or evidence of the transaction. For this purpose, a communication data recording / reproducing apparatus which records the contents of a call and reproduces the recorded contents of the call is used.

A communication data recording / reproducing apparatus detects on-hook and off-hook of a terminal device, determines connection or disconnection of a line, and records communication data transmitted on the line during the on-hook.

The communication data recording / reproducing apparatus detects whether or not the signal level of communication data is higher than a predetermined threshold value, and determines that a portion where the signal level is lower than the threshold value indicates that the call is silent, and When data is recorded on a recording medium, communication data of a talk content of a sound part whose signal level is larger than a threshold is recorded on the recording medium without recording communication data of a talk content of a silent part on the recording medium.

At this time, the communication data recording / reproducing apparatus divides the communication data into frames at predetermined time intervals, and, at intervals of a predetermined number of frames, the interval is a sound part or a silent part. An audio flag indicating whether the part is a part is generated and recorded on a recording medium together with communication data. If the interval data is silent, the voice flag is set to “0”, and if the data is voiced, the voice flag is set to “1”.

When the above-mentioned communication data recording / reproducing apparatus is used, for example, in securities transactions, communication data such as telephone calls between securities companies and customers is used as confirmation or evidence of securities transactions. Therefore, it is necessary to take measures to prevent data recorded in the communication data recording / reproducing device from being falsified. Also, it must be able to verify whether the recorded communication data has been tampered with.

[0007]

In the above-described communication data recording / reproducing apparatus, the voice flag recorded on the recording medium is rewritten so that the data of the sound part recorded on the recording medium is replaced with the data of the silent part. Is changed, the communication data recording / reproducing apparatus cannot reproduce the communication data of the sound portion.

Since the communication data can be apparently deleted or communication data can be inserted by rewriting the voice flag recorded on the recording medium, the communication data recorded on the recording medium may be falsified. . Further, it has not been considered to verify whether communication data recorded on a recording medium has been tampered with.

An object of the present invention is to provide a communication data recording apparatus and a communication data reproducing apparatus capable of verifying whether or not communication data has been falsified without falsifying communication data recorded on a recording medium. The purpose is.

[0010]

According to a first aspect of the present invention, there is provided a communication data conversion unit for converting communication data transmitted via a communication line into a data format for recording on a recording medium, A communication unit for recording the data output from the unit on the recording medium, wherein the communication data conversion unit detects a sound part and a soundless part of the communication data and detects a sound part. And a flag information generating unit that generates flag information indicating a silent portion, and generates verification information using the information on the communication data and the flag information, and generates header information including the verification information and the information on the communication data. A header information generation unit, and a block data generation unit that adds the header information to the data to generate block data.

According to a second aspect of the present invention, in the communication data recording apparatus according to the first aspect, the header information generating unit generates an ID information based on information on the communication data; An encryption unit for encrypting the ID information to generate encryption ID information, and a verification information generation unit for generating verification information using the encryption ID information and the flag information are provided.

According to a third aspect of the present invention, in the communication data recording apparatus according to the second aspect, the ID information includes an identification number unique to the communication data conversion unit, a channel number of a communication line, and the communication data. And time information about the time.

According to a fourth aspect of the present invention, there is provided a reproducing section for reproducing data recorded on a recording medium, and a communication data reproducing section for outputting the data input from the reproducing section as digital communication data or an analog communication signal. And a header information extracting unit for extracting flag information, ID information, and verification information from header information obtained from the reproducing unit, and generating encrypted ID information by encrypting the ID information. A verification information analysis unit that extracts flag information using the encryption ID information and the verification information;
A falsification verification unit that compares the flag information with the flag information extracted by the header information extraction unit and determines whether the flag information matches each other.

According to a fifth aspect of the present invention, in the communication data reproducing apparatus according to the third aspect, the ID information is converted into a data format for recording communication data transmitted via a communication line on a recording medium. An identification number unique to the communication data converter, a channel number of the communication line, and time information on the communication data are provided.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a communication data recording device and a communication data reproducing device according to the present invention. FIG. 2 is a schematic diagram illustrating a relationship between an input signal, block data, and flag information in the communication data recording / reproducing device of the present embodiment. In FIG. 1, the communication data recording / reproducing device includes a communication data converter 100, a recording / reproducing unit 200, a communication data reproducing unit 300,
0 is provided.

In this embodiment, a communication data recording / reproducing apparatus converts a communication data transmitted via a communication line into a data format for recording on a recording medium, and outputs the communication data from the communication data conversion unit. A communication data recording device including a recording unit that records data on the recording medium, a reproduction unit that reproduces data recorded on the recording medium, and data input from the reproduction unit as digital communication data or an analog communication signal. A communication data reproducing device having a communication data reproducing unit for outputting.

In this embodiment, the recording / reproducing section 200 shown in FIG. 1 has a recording section and a reproducing section. In addition, a plurality of communication lines are connected to the communication data recording / reproducing device, and the communication data converter 100 is provided for each communication line.

The communication data converter 100 includes a first data converter 101, a data compressor 102, and a flag information generator 1.
03, data buffer unit 104, header information generation unit 10
5. It has a block data generator 106.

When the communication data is an analog communication signal, the first data conversion unit 101 converts the communication data into digital data. When the communication data is digital data, the first data conversion unit 101 converts the communication data into digital data as it is, and converts it into digital data.
Output to 3. Further, it outputs information (ID number, board number, channel number, time information, and the like) relating to the input communication data to a header information generation unit 105 described later.

The data compression section 102 compresses the digital data input from the first data conversion section 101 and outputs it. The data compression unit 102, as shown in FIG.
Digital data is compressed every N samples. As shown in FIG. 2B, the compressed data (compressed data)
One frame consists of bits.

In the present embodiment, digital data of 30 msec (time corresponding to N samples) is converted into compressed data of one frame consisting of 32 bits. By compressing digital data, the amount of data is reduced, and communication data can be recorded for a long time.

The flag information generator 103 detects whether the signal level of the communication data input to the first data converter 101 is higher or lower than a predetermined threshold. The flag information generation unit 103 sets a predetermined number of frames as one interval, and sets an audio flag indicating whether the data of the interval is a silent part or a sound part at each interval. The flag information generation unit 103 generates one piece of flag information by combining voice flags of a predetermined number of intervals.

If the signal level of the communication data is higher than the threshold value, the flag information generation unit 103 determines that the communication data is a voiced part. “1” is set for a sound part, and “0” is set for a silent part.

In this embodiment, the flag information generator 10
3 sets the compressed data of 23 frames as one interval (690 msec) as shown in FIG. 2B and sets one audio flag for each interval. As shown in FIG. 2C, the flag information generation unit 103 converts the audio flag set for each interval into 16 intervals (3
68 frames: 11.04 sec), and collectively generates and outputs 16-bit 1 flag information.

In FIG. 1, the data buffer unit 104
Accumulates a predetermined number of frames of compressed data output from the data compression unit 102. Data buffer unit 1
04 does not output the compressed data of the interval in which the audio flag of “0” is set to the block data generating unit 106 based on the flag information of the flag information generating unit 103,
The compressed data of the interval in which the audio flag of “1” is set is output to the block data generation unit 106.

In this embodiment, the data buffer unit 10
4 corresponds to 368 frames (16 frames) as shown in FIG.
The compressed data of the interval or more is accumulated. In the case of the flag information shown in FIG. 2 (c), the data buffer unit 104 sets the eighth, ninth, and twelfth intervals from the third interval to the sixth interval in which the audio flag “1” is set. The compressed data of the 16th interval is output up to the 14th interval.

When the audio flag of the flag information is all "0", there is no compressed data in the block data to be described later, and information indicating that there is no compressed data is written in a part of the header information.

The header information generation unit 105 outputs information (I) related to communication data obtained from the first data conversion unit 101.
D number, board number, channel number, time information, etc.)
And the flag information obtained from the flag information generating unit 103, and generates header information including the verification information, the flag information, and the information on the communication data.

The block data generator 106 adds the header information generated by the header information generator 105 to the compressed data output from the data buffer 104 to generate block data.

FIG. 3 is a schematic diagram showing a schematic configuration of the block data generated by the block data generator. In FIG. 3, the block data includes header information generated by the header information generation unit 105 and compressed data output from the data buffer unit 104. Here, when all the audio flags in the flag information are “0”, no compressed data is output from the data buffer unit 104, and thus no compressed data exists in the block data.

The header information includes an ID number, a board number, a channel number, time information, flag information, verification information, and the like.

The ID number is a number uniquely provided for each communication data recording / reproducing device. The board number is a number that specifies one communication data conversion unit among a plurality of communication data conversion units provided in the communication data recording / reproducing device. The channel number is a number that specifies a communication line through which communication data input to the communication data conversion unit is transmitted. The time information (time code) is information on the time when communication data is input to the communication data conversion unit. With this time information, the recording start time of the communication data can be specified,
It is possible to search for communication data recorded on a recording medium or the like. The flag information is stored in the flag information generation unit 10 described above.
3 is the information generated.

The header information generator 105 will be specifically described. FIG. 4 is a schematic diagram illustrating a schematic configuration of the header information generation unit. The header information generation unit 105 includes an ID information generation unit 107, an encryption unit 108, and a flag information extraction unit 10.
9, a verification information generation unit 110 and an information generation unit 111 are provided.

The ID information generation unit 107 extracts an ID number, a board number, a channel number, and time information from the data input from the first data conversion unit 101, and arranges them according to a predetermined format. Generate ID information.

In this embodiment, the ID information is used to identify the communication data recording / reproducing apparatus, communication data conversion unit, communication line, and communication time of the communication data used for recording the communication data. , Board number, channel number and time information.

The encrypting unit 108 includes an ID information generating unit 107
Encrypts the generated ID information to generate encrypted ID information.

The flag information extraction unit 109 extracts flag information from the data input from the first data conversion unit 101.

The verification information generation unit 110 performs an exclusive OR (Ex-OR: Exclusive OR) operation using the encryption ID information and the flag information to generate verification information.

The information generating unit 111 includes the first data converting unit 1
01 and the verification information generated by the verification information generation unit 110 are arranged in accordance with a predetermined format to generate header information. As header information,
Information such as an ID number, a board number, a channel number, time information, flag information, verification information, information on a compression method, information on an error detection code, a block number, a frame number, and the like are included.

The generation of the verification information will be described. FIG.
FIG. 4 is a schematic diagram for explaining verification information. The ID information generation unit 105 shown in FIG. 4 converts the information obtained from the first data conversion unit 101 shown in FIG.
“R5”), board number (for example, “01”), channel number (for example, “03”), time information (for example,
"19990221102100, 199902210
2130...), And as shown in FIG. 5A, these pieces of information are arranged in a single data string, and ID information "R501...
2 "is generated.

The encryption unit 108 has the ID shown in FIG.
The information is encrypted, and the encrypted ID information "1101 ... 101001 ... 0110100" as shown in FIG.
0 "is generated. In the present embodiment, since the ID information is text data, it is converted to binary data and encrypted. However, if the ID information is binary data, the ID information may be used as it is, or the binary data may be encrypted. Is also good.

The flag information extraction unit 109 converts the information obtained from the first data conversion unit 101 shown in FIG.
The flag information “0011110110” as shown in FIG.
011101 ”is extracted.

The verification information generation unit 110 takes the exclusive OR of the encryption ID information shown in FIG. 5B and the flag information shown in FIG. 5C, and obtains the verification information “1000” shown in FIG.
.., 101100... 00010001 ".

Whether the compressed data stored in the recording / reproducing unit 200 (specifically, the compressed data recorded on the recording medium and the compressed data stored in the hard disk drive) has been changed based on the verification information. Can be determined.

In FIG. 1, recording / reproducing section 200 records block data input from communication data converting section 100 on a recording medium. The recording / reproducing unit 200 includes a hard disk drive (not shown) and a recording medium drive (not shown). The recording medium drive unit is, for example, an optical disk drive or a DAT (Digital Audio Tap).
e) Drive etc.

The recording medium drive section has a first database section (not shown) for recording header information and a second database section (not shown) for recording compressed data. The block data input from the communication data conversion unit 100 is temporarily stored in a hard disk drive unit, and after a predetermined amount of data is stored, transferred to a recording medium drive unit and recorded on a recording medium.

In the recording medium drive section, header information and compressed data are separately recorded as block data. When the block data is input to the recording medium drive unit, it is separated into header information and compressed data. The header information is recorded on the recording medium of the first database unit, and the compressed data is recorded on the recording medium of the second database unit. Is done.

The header information of the first database unit and the compressed data of the second database unit correspond to each other.
When the communication data is searched, the search is performed based on the header information recorded in the first database unit, and the communication data to be reproduced is the compressed data recorded in the second database unit. And played.

When an operation unit (not shown) instructs to read the block data recorded on the recording medium or the block data stored in the hard disk drive, the designated block data is transferred to the hard disk drive or the recording unit. The data is read from the medium drive unit and output to the communication data reproducing unit 300.

The communication data reproducing unit 300 includes a data compensating unit 301, a data decompressing unit 302, and a second data converting unit 303.
It has. In the present embodiment, the communication data recording / reproducing apparatus is provided with one communication data reproducing unit, but a plurality of communication data reproducing units may be provided.

The data compensating unit 301 includes the recording / reproducing unit 200
Based on the flag information of the header information of the block data input from (1), a frame consisting of data of “0” is inserted into a portion of the interval that is determined to be a silent portion and is deleted.

The data decompression unit 302 includes a data compensating unit 30
Decompress the compressed data of the block data input from 1 and output it to the second data conversion unit 303 as digital data.

The second data converter 303 converts the digital data expanded by the data expander 302 into an analog signal and outputs the analog signal. Further, the digital data can be output as it is in accordance with an instruction from an operation unit (not shown).

The verification section 400 includes a header information extraction section 40
1. It includes a verification information analysis unit 402 and a falsification verification unit 403.

The verification section 400 uses the verification information of the header information stored in the hard disk drive section or the recording medium drive section of the recording / reproduction section 200 to determine whether or not the communication data recorded on the recording medium has been tampered with. Verify.

The header information extraction unit 401
The header information is extracted from the data stored in the hard disk drive unit or the recording medium drive unit, and the flag information is transmitted to the falsification verifying unit 403 by using information (eg, ID number, board number, channel number, time information) related to the communication data. , Information necessary for ID information such as verification information)
Is output to the verification information analysis unit 402.

The verification information analysis unit 402 generates ID information from the ID number, board number, channel number, and time information extracted by the header information extraction unit 401, and encrypts the ID information to generate encrypted ID information. As the encryption method, the encryption method used in the encryption unit 108 of the header information generation unit 105 of the communication data conversion unit 100 is used.

The verification information analysis unit 402 performs an exclusive OR operation using the encryption ID information and the verification information, and extracts flag information.

The falsification verifying unit 403 includes the flag information input from the header information extracting unit 401 and the flag information
Then, it is compared with the flag information extracted in step 02 to determine whether or not the compressed data has been changed. That is, if the flag information of the header information matches the flag information obtained from the verification information, the compressed data is not changed, and if not, it is determined that the compressed data is changed.

The process of verifying whether the compressed data has been changed in the verification unit 400 will be described. FIG.
FIG. 4 is a schematic diagram for explaining a processing operation of a verification unit. FIG.
The header information extraction unit 401 shown in FIG.
Information about the ID information "R5" shown in FIG.
01 ... 990213 ... 1315312 "and the verification information" 1000.
.. 101100... 00010001 "and FIG.
The flag information “0011110110011” shown in FIG.
101 "is extracted.

The verification information analysis unit 402 generates the ID information “R501... 990213... 131” shown in FIG.
53312 ”is encrypted, and the encryption ID information“ 1101... 101001... 0110100 ”shown in FIG.
0 "is generated.

The verification information analysis unit 402 checks the encryption ID information "1101... 101001... 0" shown in FIG.
1101000 "and the verification information" 1000 ... 101100 ... 000 "extracted by the header information extraction unit 401.
10001 ”to perform an exclusive OR operation,
The flag information “00111101100” shown in FIG.
11101 "is extracted.

The falsification verification unit 403 generates the flag information information “0011110110011101” shown in FIG.
The flag information “00111101100” extracted from the header information by the header information extraction unit 401 and shown in FIG.
11101 "to determine whether or not the two pieces of flag information match.

The flag information extracted by the verification information analysis unit 402 is extracted using the flag information of the header information, the verification information, and the ID information. Therefore, if there is a data change in any one of the flag information and the verification information, the falsification verification unit 403 can detect that the flag information does not match and that the data has been changed.

Encrypting section 108 of header information generating section 105
It is impossible to change the contents of the ID information without changing the data of the encrypted ID information because the encryption method of the ID information is unknown. Therefore, when the ID information is changed, the tampering verification unit 403 does not match the flag information of the header information recorded in the recording / reproducing unit 200 with the flag information obtained from the verification information. Can be detected.

Further, the probability that the flag information of the header information and the flag information in the case of data change are very low is very low, and the data is changed (insertion or deletion of the compressed data) to the compressed data, and the flag information is changed at the same time. When the data is changed, the flag information obtained from the data change is different from the flag information obtained from the verification information, so that the data change can be detected.

Data is changed based on the digital data obtained by expanding the compressed data and compressed again to create fake compressed data, or other communication data is compressed to create fake compressed data, and the flag information and Even when the data is changed, the flag information obtained from the data change differs from the flag information obtained from the verification information, so that the data change can be detected.

Here, in the flag information, the probability that the data of the predetermined bit coincides with the data of the predetermined bit whose data has been changed is 1/2. In compressed data having N frames as one block, N-bit flag information and N
The probability of coincidence with the bit flag information is 1 / ^2N .

For example, the probability that the 16-bit flag information of the 16 intervals matches the 16-bit flag information of the changed data is 1/2 ¹⁶ = 1/65536.
Becomes

When the data of the flag information for M intervals is changed in order to falsify the communication data, all the flag information of the M intervals before the data change matches the M flag information after the data change. Probability is 1/2
^The probability that the flag information before the data change matches the flag information after the data change is extremely low, and it is necessary to detect whether or not the data has been changed using the flag information for M intervals. Can be.

Further, in this embodiment, the ID information is encrypted to obtain the encryption ID information, and the exclusive OR is calculated using the encryption ID information and the flag information to generate the verification information. The verification information may be generated by encrypting the flag information to generate encryption flag information, performing an exclusive OR operation using the ID information and the encryption flag information.

In this case, the verification section 400 encrypts the flag information to generate encryption flag information, performs an exclusive OR operation using the encryption flag information and the verification information, and extracts the flag information.

In this embodiment, the ID information is encrypted to generate the encrypted ID information, and the verification information is generated by using the encrypted ID information and the flag information. However, the ID information is generated by using the flag information. May be encrypted to generate verification information.

In this case, the verification unit 400 extracts the ID information by decrypting the verification information using the flag information and extracts the ID information from the verification information by the reverse method of the encryption used when the verification information is generated. The obtained ID information is compared with the ID information obtained from the header information to verify whether data has been changed.

In this embodiment, the ID information is encrypted to generate the encrypted ID information, and the verification information is generated by using the encrypted ID information and the flag information. However, the flag information is generated by using the ID information. May be encrypted to generate verification information.

In this case, the verification unit 400 uses the reverse method of the encryption used when generating the verification information to generate the I
The decryption of the verification information is performed using the D information, the flag information is extracted, the flag information obtained from the verification information is compared with the flag information obtained from the header information, and it is verified whether the data has been changed. Do.

As described above, by generating the verification information by using the flag information indicating the sound part or the silent part of the communication data, the reproduction of the communication data is not affected by the sound quality deterioration, the data change, and the like. It can be determined whether the data has been tampered with.

[0078]

According to the present invention, the communication data recorded on the recording medium is not falsified. Further, it is possible to verify whether or not the communication data has been falsified.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a communication data recording device and a communication data reproducing device according to the present invention.

FIG. 2 is a schematic diagram illustrating a relationship between an input signal, block data, and flag information in the communication data recording / reproducing device of the embodiment.

FIG. 3 is a schematic diagram illustrating a schematic configuration of block data generated by a block data generation unit.

FIG. 4 is a schematic diagram showing a schematic configuration of a header information generation unit.

FIG. 5 is a schematic diagram for explaining verification information.

FIG. 6 is a schematic diagram for explaining a processing operation of a verification unit.

[Explanation of symbols]

100: communication data conversion unit, 101: first data conversion unit, 102: data compression unit, 103: flag information generation unit, 104: data buffer unit, 10
5 ... header information generation unit, 106 ... block data generation unit, 107 ... ID information generation unit, 108 ...
Encryption unit, 109 ... Flag information extraction unit, 110 ...
A verification information generation unit, 111 ... an information generation unit; 200 ・
..Recording and reproducing unit. 300 communication data reproducing unit, 30
1 ... Data compensator, 302 ... Data decompressor, 3
03: second data conversion unit. 400: verification unit, 4
01 ... header information extraction unit, 402 ... verification information analysis unit, 403 ... falsification verification unit.

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Claims (5)

[Claims] 1. A communication data conversion unit for converting communication data transmitted via a communication line into a data format for recording on a recording medium, and recording the data output from the communication data conversion unit on the recording medium. In a communication data recording device comprising a recording unit, the communication data conversion unit,
A flag information generating unit that detects a voiced portion and a voiceless portion of the communication data to generate flag information indicating voiced and voiceless portions, and generates verification information using information and the flag information on the communication data. A header information generation unit that generates header information including the verification information and information on the communication data; and a block data generation unit that generates block data by adding the header information to the data. Communication data recording device. 2. The communication data recording device according to claim 1, wherein the header information generation unit generates ID information based on information on the communication data;
Communication data comprising: an encryption unit that encrypts the ID information to generate encryption ID information; and a verification information generation unit that generates verification information using the encryption ID information and the flag information. Recording device. 3. The communication data recording device according to claim 2, wherein the ID information includes an identification number unique to the communication data conversion unit, a channel number of a communication line, and time information on the communication data. A communication data recording device characterized by the above-mentioned. 4. A communication data reproducing apparatus comprising: a reproducing section for reproducing data recorded on a recording medium; and a communication data reproducing section for outputting the data input from the reproducing section as digital communication data or an analog communication signal. In the apparatus, flag information and ID are obtained from header information obtained from the reproducing unit.
A header information extraction unit that extracts information and verification information, a verification information analysis unit that encrypts the ID information to generate encrypted ID information, and extracts flag information using the encrypted ID information and the verification information. And a falsification verifying unit that compares the flag information with the flag information extracted by the header information extracting unit and determines whether or not the flag information matches each other. 5. The communication data reproducing apparatus according to claim 3, wherein said ID information is an identification number unique to a communication data conversion unit for converting communication data transmitted via a communication line into a data format for recording on a recording medium. A communication line reproducing apparatus, a communication line channel number, and time information on the communication data.